APA

Gregg J. R., . (1966). Gregg speed building for colleges. New York: Gregg Division, McGraw-Hill.

Chicago

Gregg John Robert, . 1966. Gregg speed building for colleges. New York: Gregg Division, McGraw-Hill.

Harvard

Gregg J. R., . (1966). Gregg speed building for colleges. New York: Gregg Division, McGraw-Hill.

MLA

Gregg John Robert, . Gregg speed building for colleges. New York: Gregg Division, McGraw-Hill. 1966.